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What Do I Do If Some Ports in the Public Cloud System Are Inaccessible?

Symptom: Users in some areas cannot access some ports in the public cloud system.

Analysis: Ports listed in the following table are high-risk ports and are blocked by default.

Table 1 High-risk ports

Protocol

Port

TCP

42, 135, 137, 138, 139, 444, 445, 593, 1025, 1068, 1434, 3127, 3128, 3129, 3130, 4444, 4789, 5554, 5800, 5900, and 9996

UDP

135 to 139, 1026, 1027, 1028, 1068, 1433, 1434, 4789, 5554, and 9996

Solution: It is recommended that you use ports not listed in the table for your services.

Parent topic: Security